参数资料
| 型号： | MC34716EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER DDR 26QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 6 V |
| 输出数： | 2 |
| 输出电压： | 0.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-VFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
V TT2 <=V OVF2
I OUT2 >=I LIM2
TIMEOUT=1
V IN < 3.0 V
V DDQ =OFF
V TT =OFF
V REF =OFF
PG = 1
3.0 V<=V IN <=6.0 V
T IMEOUT
Expired
Short-circuit
TIMEOUT=1
V DDQ >=V OVR1
T J >=170°C
V TT =ON
V REF =ON
PG = 1
V REF =ON
I OUT1 >=I LIM1
PG = 1
TIMEOUT=1
SD = 0 &
STBY=x
V TT <=V UVF2
V TT
Under-voltage
V DDQ =ON
V TT =ON
V REF =ON
PG = 1
V TT >=V OVR2 V TT =>=V UVR2
V TT
Over-voltage
V DDQ =ON
V TT =ON
V REF =ON
PG = 1
T J >= 170°C T J <=145°C
Channel 2 T IMEOUT Expired
Thermal Shutdown
V DDQ =ON
V TT =OFF
V REF =ON
PG = 1 T IMEOUT
Expired
Channel 2
Over-current
V DDQ =ON
V TT =OFF
V REF =ON
PG = 1
For>=10 ms
Power Off
Shutdown
V DDQ = Discharge
V TT = Discharge
V REF = Discharge
PG = 1
SD = 1 &
SD = 1 & STBY=1
STBY=1
Normal
F SW is programmed
I LM1 is programmed
V DDQ and V TT t ss = 1
V DDQ = ON
V TT = ON
V REF =ON
PG = 0
T IMEOUT
Expired
V TT V DDQ
Short-circuit
V OUT1 =ON V DDQ =OFF
V OUT2 =OFF V TT =ON
V REF =ON V REF =ON
PG = 1 PG = 1
TIMEOUT=1
I OUT1 >=I SHORT1
I OUT2 >=I SHORT2
Figure 8. Operation Modes Diagram
SD = 1 &
STBY=0
Standby
V DDQ =OFF
V TT =OFF V DDQ <=V UVF1
V REF =ON
PG = 1 V DDQ
Under-voltage
V DDQ =ON
V TT2 =ON
V REF =ON
PG = 1
V DDQ >= V UVR1
V DDQ
Over-voltage
V DDQ <= V OVF1 V DDQ =ON
V OTT =ON
V REF =ON
PG = 1
T J <=145°C
T IMEOUT Expired Channel 1
Thermal Shutdown
V DDQ =OFF
T IMEOUT
Expired
Channel 1
Over-current
V DDQ =OFF
V TT =ON
For>=10 ms
MODES OF OPERATION
The 34716 has three primary modes of operation:
Normal Mode
In normal mode, all functions and outputs are fully
operational. To be in this mode, the V IN needs to be within its
operating range, both Shutdown and Standby inputs are
high, and no faults are present. This mode consumes the
most amount of power.
Standby Mode
This mode is predominantly used in Desktop memory
solutions where the DDR supply is desired to be ACPI
compliant (Advanced Configuration and Power Interface).
When this mode is activated by pulling the STBY pin low, V TT
is put in High Z state, I OUT2 = 0 A while V DDQ and V REF stay
active. This is the S3 state Suspend-To-Ram or Self Refresh
mode and it is the lowest DRAM power state. In this mode,
the DRAM will preserve the data. While in this mode, the
34716 consumes less power than in the normal mode,
because the buck converter and most of the internal blocks
are disabled.
Shutdown Mode
In this mode, activated by pulling the SD pin low, the chip
is in a shutdown state and the outputs are all disabled and
discharged. This is the S4/S5 power state or Suspend-To-
Disk state, where the DRAM will loose all of its data content
(no power supplied to the DRAM). The reason to discharge
the V TT and V REF lines is to ensure upon exiting, the
shutdown mode that V TT and V REF are lower than V DDQ ,
otherwise V TT can remain floating high, and be higher than
V DDQ upon powering up. In this mode, the 34716 consumes
the least amount of power since almost all of the internal
blocks are disabled.
START-UP SEQUENCE
When power is first applied, the 34716 checks the status
of the SD and STBY pins. If the device is in a shutdown mode,
no block will power up and the output will not attempt to ramp.
If the device is in a standby mode, only the V DDI internal
supply voltage and the bias currents are established and no
further activities will occur. Once the SD and STBY pins are
released to enable the device, the internal V DDI POR signal is
also released. The rest of the internal blocks will be enabled,
and the buck converters switching frequency and the V DDQ
34716
Analog Integrated Circuit Device Data ?
16
Freescale Semiconductor
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